The function generator is a very useful instrument in the hobbyist lab. It is a device that generates electric signals with different shapes, like sine, square and triangular waves, to test various circuits, such as amplifiers and filters, both in low and high frequencies. If you are one of those people that likes to build Audio circuits, electronic musical instruments, or even radio circuits, you will need a function generator for testing and tuning the devices you make.
There are two main alternatives to own such a device: you can buy one, or you can build one.
Just a little experience in soldering components, and the ability to read schematics, will set you on the right track, with the help of this companion video on YouTube:
And you’ll be able to easily make a function generator good for audio applications.
Here is the zip file with the schematic and a few extra information for you: